Surfaces
n. 表面；曲面（surface的复数）
🗣️ 情景例句
You and Dr. Philip Stewart--
你和Philip Stewart医生
Jack is up and about now.
杰克病后复原了。
they can locate and steer clear of obstacles -- or locate flying insects on which they feed.
并能通过回声来确定并躲开障碍物，或找到它们赖以为生的昆虫。